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The default navigation behavior works fine to click and drag to pan the map around.
But if you have a vector layer displayed, and one of popups, hover, or tooltips enabled... if you happen to click inside one of the vector shapes, click and drag won't work.
attaching a patch to fix the problem. When we create a new OpenLayers.Control.SelectFeature, we have to manually set .handlers['feature'].stopDown and .handlers['feature'].stopUp to 'FALSE'.